"David my servant", and "my servant David" - Eze 37.
Again, like father like son. The religious experts were fixated on literal genealogy, but the common people understood his having David's character trait of mercy, like father like son. "Son of David, have mercy on me..."
If David called him 'lord', how then is he his son? The experts couldn't answer.. same as today.
The people loved David because he went out amongst them. Another example of a name as a prophecy, David meaning "beloved".
Yeshua is a decedent of David on Mary's side, according to a number of scholars who've overcome an error confusing Mary's father with Joseph.